var ismac=false;
var isopera=false;
var isie=false;
browinfo="";
if(navigator.userAgent.indexOf("Mac")!=-1){
		ismac=true;
		browinfo="mac";
}
if(navigator.userAgent.indexOf('Opera')!=-1){
		isopera=true;
		browinfo="opera";
}
if(navigator.userAgent.indexOf("IE")!=-1 && navigator.userAgent.indexOf("Opera")==-1 && navigator.platform=="Win32")
{
	  isie=true;
  	browinfo="ie";
}